As a rule, understand the instantaneous velocity of a body as a concept of actual speed of time at present. For calculation of actual speed decide on type of the movement of a body and by means of formulas calculate it time at present.
It is required to you
- speedometer, radar, stop watch and roulette.
Instruction
1. Measurement of actual speed of a telayesla is an opportunity, equip a body with a speedometer - then at the movement on a scale analog or the board of the digital device will be reflected value of instantaneous velocity of a body of time at present. For measurement of speed of a body by means of the radar connect it with a motionless reference system. As a rule, it is the earth. Direct it to a moving object - on the screen of the radar the actual speed of a moving object will appear.
2. Actual speed uniform to a dvizheniyaizmerta the distance passed by evenly moving body by means of a roulette at the same time having measured time for which it was passed by means of a stop watch. Measure distance in meters, and time in seconds. After that divide distance into time for which it was passed (v=S/t). It will also be the actual speed of a body at any moment.
3. Actual speed at uneven such type of the movement of a dvizheniipra speed constantly changes. For determination of actual speed at present of time by means of the accelerometer or any other way measure acceleration of a body. It will be positive if speed increases also negative if speed decreases. If the body begins to move from a condition of rest, its actual speed of time will be equal at present to performing acceleration for a while which the body is in the movement (v=a•t). If before acceleration the body already had some speed, add it to result of calculations.
4. Actual speed free padeniyapr free fall measure time in seconds which the body was in flight. After that increase value of acceleration of gravity (9.81 m/s²) by the time spent of a body in flight. Actual speed of freely falling body at present of time, without air resistance will be result.